A kind of environment-friendly high-efficiency low flow resistance filter paper and preparation method thereof

Abstract

Disclosed is efficient low-flow-resistance filter paper. The filter paper is composed of 2-8 independent layers. The filter paper is characterized in that each independent layer is prepared from a low-melting-point organic fiber cloth with the thickness being 0.01-1.0 mm, and glass fiber with the thickness being 0.1-1.8 mm, wherein the average diameter of the glass fiber of the first layer is 0.5-1.0 micrometer, the average diameter of the glass fiber of the second layer is 1.1-1.5 micrometers, the diameter of the fiber of the next layer is 0.1-1.0 micrometer larger than that of the fiber of the last layer, the glass fiber inside the same layer and the glass fiber of different layers are bonded through hot-pressing melting of the low-melting-point organic fiber cloth. The invention further discloses a preparation method of the efficient low-flow-resistance filter paper. The preparation method is characterized by comprising the following steps of 1, dispersion and pulping; 2, storage pool pH regulation; 3, wet forming; 4, hot pressing composition; 5, drying. The efficient low-flow-resistance filter paper has the advantages of lowering the cost, and being efficient, low in flow resistance and environmentally friendly.

Description

technical field [0001] The invention relates to a filter material and a preparation method thereof, in particular to an environment-friendly filter paper with high efficiency and low flow resistance and a preparation method thereof. Background technique [0002] Air filter paper is widely used. With the rapid development of social economy, the requirements for clean rooms such as medicine, biological sciences, integrated circuits, and sterile operating rooms are getting higher and higher. In order to improve the filtration efficiency, traditional air filter paper can only be passed through Increase the bulk density and thickness of the air filter paper, the increase of the bulk density and thickness will often increase the flow resistance of the air filter paper, and the increase of the flow resistance will reduce the service life of the air filter paper. , it is necessary to increase the weight of the air filter paper to be manufactured, but the traditional filter material ...

AI Technical Summary

Problems solved by technology

[0002] Air filter paper is widely used. With the rapid development of social economy, the requirements for clean rooms such as medicine, biological sciences, integrated circuits, and sterile operating rooms are getting higher and higher. In order to improve the filtration efficiency, traditional air filter paper can only be passed through Increase the bulk density and thickness of the air filter paper, the increase of the bulk density and thickness will often increase the flow resistance of the air filter paper, and the increase of the flow resistance will reduce the service life of the air filter paper. , it is necessary to increase the weight of the air filter paper to be manufactured, but the traditional filter material is a single layer, and the pore size of the filter element is single, which cannot meet the unity of processing capacity and processing accuracy, so people use composite filter material technology to combine two or more Filter materials with different precisions are combined to achieve a balance between processing capacity and processing accuracy

[0003] The Chinese patent with the patent number CN200910043469.2 proposes a titanium filter element with gradient pore structure and its preparation method. Titanium powder, titanium hydride powder, sodium chloride powder are mixed uniformly and then mixed with binder to granulate, and powder co-injection molding technology is adopted. , the core part is injected first, and then the outer layer is injection-molded. The feeding materials of the two injection moldings are different. After the injection molding is degreased, desalted and sintered, the product is obtained. This invention solves the problem of core / shell pore structure control and The problem of bonding strength is to achieve high interface bonding strength and controllable pore structure (the porosity and pore size of the core / shell layer can be controlled between 30-70 and 1400), but because titanium is a rare metal, the cost is high , it is more difficult to promote, and at the same time, the metal filter element is not easy to control during the preparation and sintering process, and the uniformity of the pore size is low

[0004] The Chinese patent with the patent number CN 201020301426.8 designed a gradient filtration composite melt-blown filter element, which solves the technical problems that the single-layer filter element has a single pore size, cannot meet the requirements of processing capacity and processing accuracy at the same time, and has a short service life of the filter element. However, the composite melt-blown The technical preparation of filter elements is costly and the output is large, which cannot fully meet the current market demand, which greatly limits its application

[0005] The Chinese patent with patent number CN201220360483.2 designed a multi-layer gradient filter composite fabric to solve the problem that the traditional multi-layer filter fabric not only has complicated manufacturing process and high production cost, but also the surface layer is easily blocked during use, and the filtration efficiency and filtration accuracy are low. , the problem of short service life, but the filter material uses organic materials, which not only has poor high temperature resistance, but also has a small output

Images